Method of making sheet-metal elbows.



No. 824,302. PATENTED JUNE 26, 1906.

W. H. KLAUER. METHOD OF MAKING SHEET METAL BLBOWS.

APPLIUATIOH FILED SEPT. 19, 1905.

3 SHEETS-SHEET 2 WITNESSES: INVENTOR.

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PATBNTED JUNE 26, 19136.

W. H. KLAUER. METHOD OF MAKHQQ SHEET METAL ELBOWS.

AYPLIULTIOH rum) SEfPT.19.1905.

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l NVENTORQ gY WIKLLW \LKKW v w. W- Cull ATTORNEY.

WILLIAM H. KLAUER, OF DUBUQUE, lOlNA.

METHOD OF MAKING SHEET-METAL ELBOWS.

Specification of Letters Patent.

Patented June 28, 1906.

Application llld 5 13MB" 15, 1805. Serial Ho. 279,103-

To all whom it may concern.-

Be it known that 1, WILLIAM H. Kulusn, a citizen of the United States, residing at Dubuque, in the county of Dubuque and State of Iowa, have invented certain new and useful improvements in Methods of Mal-fin is a specification.

In the manufacture of sheet-metal tubes and elbows, ially those that erefssteet of sheet metal and then plaited or f olded he fore the are formed into a tube oreaelhow,;

eat culty has been experienced in orming the seams and locking the edges of the blank together to form the tube, owing, to the many thicknesses of theplailed or folded metal where the edges are joined?- Further, it has been exceedingly diffieult if not practically impossible, to eorrugete a sheet-metal elbow, especially along the seam on the concave surface or opposite on the convex surface, and on account of these diiliculties many of the sheet-mete] elbows are united together by legpisg the edges of the blank an securing t em to ther in some convenient manner to form t e elbow, their corrugating the ends and sides and leaving the parts along the seam er 0p osite enthe convex surface without corrugation; but this mode of manufacturing pleited sheet-motel elbows is inconvenient, and the elbow is not as durable or convenient in use.

To avoid these various difliculties and to provide means whereby the plaited elbows may be formed with a. seam of no unusual thickness and still maintain its ri 'dityond govide means whereby the entire e bow may corrugated are the leading objects of my 'h invention.

It consists, essentially, in first cuttin out? of a. sheet of metal a blank of the lengt and size required to form the elbow, cutting re" ceases at intervals along the of the blank, forming folds or p of the blank with one sheet of the fold he? an uncut edge thereon and forming a pan in the plcit, and then uniting and locking the uncut edges of the blank together to form the seam, and subsequently forming it into an elbow. 7 The followin r specification will give a more perfect unllerstamding of the invention, together with the manner of construction and mode of uniting the parts together, when opposite edges. 5; nits crosswise taken in connection with the drawings accompanying the seme and forming a part "hereof.

Figure 1 is a plan view of a blank with the recesses cut out of its opposite edges, said re g "cesses being twice the size of the uncut parts SheetPMetal Elbows, of which the following between the recesses and cut from the same lane in the op osite ed 5 of the blank. 7 ig. 2 is a plan now of the lank with the reeesses out out, said recesses being a trifle danger than the remaining portions ofthe of the blank between the recesses. Fig.

3 is a. plan view of the blank shown in Fig. 1 after it has been folded or pleited, she the uncut edges just in contact with see other and forming a. continuous ed e of one thickness. Fig. 4 is a ers active view taken from one side of the la shown in Fig. 3 after it is folded or lait-ed with pertsrut away. Fig. Sshows on end view of Fig. 3 after the hooks which constitute the lock are formed thereon. Fig. 6 is a plan view of a. biank'wherein the recesses are cut out from different planes or arts in the op 'osite edges. 7 is a p on view of the lank shown in lg. 6 after it has been plaited, showing th'at'the uncut edges of the blank lap a trifle over one another. Fig. 8 is a sectional view through line a: a: of Fig. 7 after the edges have been bent into position for locking. Fig. 9 is l-lie same view as Fi 8 after the seam has beenfound. Fig. was a plan view of a blank with both the inner corners of the recesses cut out. rounded and the cut iron: the some Parts or lanes in the opposite of the b ank. ii. 11 is a Ion view of' the blank shown in lg. 16 a or it has 1 eerr plsited. Fig. 12 is a plan view of a blank with the recesses out out, but leaving orient the inner corners of each recess rounded, the other rectangular, and the recesses out from difl'erent portions in the opposite edges of the blank. Fig. 13 is a plan view of ii heblenlc shown in Fig. 32 after it has been folded or jila-ited. Fig. 14 is a cross-section taken through the center of a complete corrngeled elbow mode from the blank shown In Fig.1; i .Jkli letters of reference denote correspending parts in'eaeh nf the figures.

Referring to the drawin s, A designates a. blank. Along lts'longitmlilml edges on out out the some mambo-r of irofcrnhly rls'nmgulair notches or recesses ll as the number of leiting or folding the blank, uniting and! ocking the unrernoved edges of the blank and then forming it into an elbow.

6. The method of forming pleited sheetmetal elbows, which consists in removing portions of the opposite edges of a blank, g pleiting or folding the blank with each fold of three thicknesses of metal one thickness of which pro'ects beyond the edge of the other two and l eaving the opposite edges of the blank with only one thickness of metal, uniting the unremoved edges of the blank, and then forming it into an elbow.

7. The method of manufacturing pieiteti sheet-metal elbows, which consists in remov- I 5 ing portions of the opposite lon itudine-l edges of a blank, pleiting or folding t 0 blank and leaving a continuous edge of one thickness alon the opposite edges of the blank, looking t e unremoved edges of the blank, and forming the locked blank into an elbow.

In testimony whereof'l aifix my signature in presence of two witnesses.

WILLIAM H. KLAUER.

Witnesses:

M. M. CADY, R. W. Smrson. 

